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Colossal magnetoresistance

About: Colossal magnetoresistance is a research topic. Over the lifetime, 3658 publications have been published within this topic receiving 130104 citations.


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Journal ArticleDOI
TL;DR: In this paper, the structural and magnetic phase diagram of the manganites La1−xAgxMnO3 shows similarity with the La 1−x′Srx′McNO3 series, involving a metallic ferromagnetic domain at relatively high temperature (≈300 K).

129 citations

Journal ArticleDOI
TL;DR: Investigations in external magnetic fields up to 5 T reveal the simultaneous occurrence of magnetocapacitance and magnetoresistance of truly colossal magnitudes in HgCr2S4.
Abstract: We present a detailed study of the dielectric and charge transport properties of the antiferromagnetic cubic spinel ${\mathrm{HgCr}}_{2}{\mathrm{S}}_{4}$. Similar to the findings in ferromagnetic ${\mathrm{CdCr}}_{2}{\mathrm{S}}_{4}$, the dielectric constant of ${\mathrm{HgCr}}_{2}{\mathrm{S}}_{4}$ becomes strongly enhanced in the region below 60--80 K, which can be ascribed to polar relaxational dynamics triggered by the onset of ferromagnetic correlations. In addition, the observation of polarization hysteresis curves indicates the development of ferroelectric order below about 70 K. Moreover, our investigations in external magnetic fields up to 5 T reveal the simultaneous occurrence of magnetocapacitance and magnetoresistance of truly colossal magnitudes in this material.

129 citations

Journal ArticleDOI
TL;DR: In this article, the authors used molecular-beam-epitaxy growth techniques to synthesize ferromagnet/insulator/ferromagnetic trilayer heterostructures with the "colossal" magnetoresistance material La1−xSrxMnO3 as the ferromagnetic material.
Abstract: Using molecular-beam-epitaxy growth techniques, we have synthesized ferromagnet/insulator/ferromagnet trilayer heterostructures with the “colossal” magnetoresistance material La1−xSrxMnO3 as the ferromagnet. These trilayer films were fabricated into magnetic tunnel junctions which exhibit magnetoresistance ΔR/R(H) of as much as 450% in 200 Oe applied field at 14 K, and which persists up to ∼250 K. In situ reflection high-energy electron diffraction (RHEED) allows us to correlate the quality of the epitaxial growth with the magnetoresistive properties. Samples which showed signs of disorder in RHEED also exhibit disorder effects in low-temperature transport and have smaller magnetoresistance which vanishes at lower temperatures.

129 citations

Journal ArticleDOI
TL;DR: It is established that the MR in Sr2FeMoO6 is dominantly controlled by a new mechanism, derived from the magnetic polarization of grain-boundary regions acting like spin valves, leading to behavior qualitatively different from that usually encountered in tunneling MR.
Abstract: We present magnetization (M) and magnetoresistance (MR) data for a series of ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ samples with independent control on antisite defect and grain-boundary densities, which reveal several unexpected features, including a novel switching-like behavior of MR with M. These, in conjunction with model calculations, establish that the MR in ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ is dominantly controlled by a new mechanism, derived from the magnetic polarization of grain-boundary regions acting like spin valves, leading to behavior qualitatively different from that usually encountered in tunneling MR. We show that a simple and useful experimental signature for the presence of this spin-valve-type MR (SVMR) is a wider hysteresis in MR compared to that in M.

129 citations

Journal ArticleDOI
TL;DR: The magnetic and magnetotransport properties of manganites are strongly dependent on the doping level x and the oxygen stoichiometry z. as discussed by the authors showed that low doped manganite is magnetically inhomogeneous.

129 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202330
202252
202139
202038
201937
201837